form {
    width: 600px;
    padding: 20px;
    border: 1px solid pink;
    margin: 30px auto;
    display: flex;
    flex-direction: column;
    padding-top: 50px;
    position: relative;

}

form>span {
    /* 水平居中 */
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 5px;
    font-size: 20px;
    color: red;
    display: none;
}

form>label {
    height: 50px;
    font-size: 30px;
}

form>label>input {
    width: 300px;
    padding-left: 20px;
    font-size: 30px;
    height: 40px;
}

form>button {
    padding: 5px;
    font-size: 30px;
    /*  鼠标的样式 */
    cursor: pointer;
}

form>label>select {
    padding: 5px;
    padding-left: 20px;
    font-size: 20px;
}